My outgoing email is getting flagged as spam
I'm using sendmail on a dedicated server I lease from APlus.net, running FC4. This server has two domain names, including the original generated by APlus.net incorporating its static IP address (216-55-142-104.dedicated.abac.net) and the domain name I registered for it . If you reverse IP lookup the IP address, you only get the APlus.net name, not mine. I've had trouble choosing a domain name for confDOMAIN_NAME that doesn't cause lots of email to be rejected as SPAM, because I think receiving SMTP servers both (a) do a reverse IP address lookup on the address which connected to them and discover the name doesn't match the name given by the EHLO/HELO command, and (b) check the EHLO/HELO name for various suspicious characteristics. I'm assuming the confDOMAIN_NAME setting is used as the EHLO/HELO domain name. If I use the APlus.net name for the server in confDOMAIN_NAME, various SPAM filters give all the email really high scores because of the IP address incorporated in the name. If I use my domain name, other servers flag me as SPAM because the reverse IP address lookup gives the APlus.net name.
I'm a sendmail newbie. Am I understanding the problem correctly? Any advice?